1. **State the problem:** We have a data set of credits taken by 13 full-time college students: 8, 8, 11, 11, 8, 9, 7, 7, 7, 7, 7, 10. We need to find the mean of this data. 2. **Formula for mean:** The mean (average) is calculated by summing all the data values and dividing by the number of values. $$\text{Mean} = \frac{\text{Sum of all data values}}{\text{Number of data values}}$$ 3. **Calculate the sum:** $$8 + 8 + 11 + 11 + 8 + 9 + 7 + 7 + 7 + 7 + 7 + 10 = 100$$ 4. **Count the number of data points:** There are 12 values listed, but the problem states 13 students. Checking the data again: 8, 8, 11, 11, 8, 9, 7, 7, 7, 7, 7, 10. This is only 12 values. Possibly a value is missing or a typo. Assuming the data given is correct with 12 values. 5. **Calculate the mean:** $$\text{Mean} = \frac{100}{12} = 8.3333...$$ 6. **Round to one decimal place:** $$8.3$$ 7. **Conclusion:** The mean number of credits taken is approximately 8.3. Note: If the data set should have 13 values, please verify the data. Based on the 12 values given, the mean is 8.3.